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DE2437462A1
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Carrier comprising two channels and intermediate stays - has third web of non-flat portions joined by flat portions
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GB1473700A
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Method and apparatus for making truss members
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CA1031147A
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Method and apparatus for making truss members
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Method and apparatus for making truss members
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Apparatus for making truss members
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Truss construction
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Method for making truss members
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Truss construction
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Method and apparatus for making truss members
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Spiral staircase
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